Is Ceylon cinnamon safer than Cassia for daily use?

Ceylon cinnamon is likely safer for daily use because Cassia contains far more coumarin, which can harm the liver at high doses.

There are two fundamentally different spices sold under the name "cinnamon," and confusing them could be harmful to your health if you consume cinnamon regularly or in supplemental doses.

Cassia cinnamon (Cinnamomum cassia, also called Chinese cinnamon) is what you almost certainly have in your pantry. It accounts for the vast majority of cinnamon sold in the United States and Europe. It is cheap, strong-flavored, and widely available.

Ceylon cinnamon (Cinnamomum verum, also called "true cinnamon") is lighter in color, milder in flavor, more expensive, and primarily grown in Sri Lanka. It is the one you want.

What you can do

For daily or supplement use, buy Ceylon (true) cinnamon, Cinnamomum verum, which contains only trace coumarin¹.
Spot Ceylon by its many thin, papery layers, light tan-brown color and crumbly texture; Cassia is a hard, dark reddish single scroll.
If a package just says cinnamon, assume it is Cassia; very cheap cinnamon is usually Cassia as well.

Be careful if

The EFSA tolerable daily coumarin intake is 0.1 mg/kg (7 mg for a 70 kg adult); heavy consumers of Cassia cinnamon may reach it³.
Taking Cassia daily at the 1–6 g doses studied for blood sugar would far exceed the safe coumarin limit.

Go deeper

How it works What it does in your body, in plain words 1 min

The critical difference is coumarin, a naturally occurring compound found in high concentrations in Cassia cinnamon. Cassia contains roughly 1% coumarin by weight, while Ceylon cinnamon contains only trace amounts — approximately 0.004%¹.

Coumarin is hepatotoxic. At high doses, it damages the liver³. The European Food Safety Authority set a tolerable daily intake (TDI) of 0.1 mg per kilogram of body weight. For a 70 kg adult, that is just 7 mg per day — an intake that heavy consumers of Cassia cinnamon may reach³.

If you are taking cinnamon daily for blood sugar benefits (which the research supports at 1-6 grams per day), using Cassia cinnamon means you would be consuming many times the safe coumarin limit every single day.

Ceylon cinnamon has negligible coumarin. You can take therapeutic doses without liver risk¹.

How to Tell Them Apart

Sticks: Ceylon cinnamon sticks have many thin, papery layers rolled together (like a cigar). Cassia sticks are a single thick, hard bark rolled into a scroll.
Color: Ceylon is tan-brown and lighter. Cassia is dark reddish-brown.
Texture: Ceylon crumbles easily. Cassia is hard and woody.
Price: If it is suspiciously cheap, it is Cassia.
Label: If the package just says "cinnamon" without specifying, it is almost certainly Cassia.

The evidence The studies, what they found, and how much to trust them 1 min · 3 sources

Both Ceylon and Cassia cinnamon contain cinnamaldehyde, the compound responsible for cinnamon's flavor and many of its health benefits. Both types have demonstrated anti-inflammatory, antioxidant, and blood-sugar-lowering properties in research².

The key bioactive compounds in cinnamon include cinnamaldehyde, cinnamic acid, and cinnamate — all present in both varieties². The anti-inflammatory effects operate through inhibition of NF-kB and other inflammatory pathways, and these mechanisms are not dependent on coumarin content.

The bottom line: if you are using cinnamon as a daily supplement (which the evidence supports for blood sugar management), switch to Ceylon. The health benefits are comparable, and you eliminate the coumarin risk entirely^1,3.

Sources

Quantification of flavoring constituents in cinnamon: high variation of coumarin in cassia bark from the German retail market and in authentic samples from Indonesia. Woehrlin F, Fry H, Abraham K, Preiss-Weigert A. Journal of Agricultural and Food Chemistry, 2010. PubMed 20853872
Cinnamon: a multifaceted medicinal plant. Rao PV, Gan SH. Evidence-Based Complementary and Alternative Medicine, 2014. PubMed 24817901
Toxicology and risk assessment of coumarin: focus on human data. Abraham K, Wöhrlin F, Lindtner O, Heinemeyer G, Lampen A. Molecular Nutrition & Food Research, 2010. PubMed 20024932